Nicks children___their homework three hours ago.b) did a) made
2. We are____some research at the moment. a) making b) doing
3. I m afraid Ive____a mistake in the calculation a) made b) done
4. He is working on an interesting____on nano-technology b) research a) investigation
5, The___ for the detection of the killer will continue. a) investigation b) research

1 did 2 making3 made4 research5 investigation

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